kernel/git/stable/linux.git/sound/usb/proc.c, branch linux-5.2.y

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156

2019-05-30T18:26:35+00:00

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Reviewed-by: Richard Fontana Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman

ALSA: usb-audio: Expose sample resolution through proc interface

2019-02-18T08:36:09+00:00

At least some USB devices use (MSB-aligned) audio format larger than the actual resolution of the device. In order to expose the actual device resolution (bBitResolution), add extra field to the procfs stream info interface. Signed-off-by: Jussi Laako Signed-off-by: Takashi Iwai

ALSA: usb: Clean up with new procfs helpers

2019-02-06T17:11:57+00:00

Simplify the proc fs creation code with new helper functions, snd_card_ro_proc_new() and snd_card_rw_proc_new(). Just a code refactoring and no functional changes. Reviewed-by: Jaroslav Kysela Signed-off-by: Takashi Iwai

ALSA: usb-audio: Avoid nested autoresume calls

2015-08-26T13:38:25+00:00

After the recent fix of runtime PM for USB-audio driver, we got a lockdep warning like: ============================================= [ INFO: possible recursive locking detected ] 4.2.0-rc8+ #61 Not tainted --------------------------------------------- pulseaudio/980 is trying to acquire lock: (&chip->shutdown_rwsem){.+.+.+}, at: [] snd_usb_autoresume+0x1d/0x52 [snd_usb_audio] but task is already holding lock: (&chip->shutdown_rwsem){.+.+.+}, at: [] snd_usb_autoresume+0x1d/0x52 [snd_usb_audio] This comes from snd_usb_autoresume() invoking down_read() and it's used in a nested way. Although it's basically safe, per se (as these are read locks), it's better to reduce such spurious warnings. The read lock is needed to guarantee the execution of "shutdown" (cleanup at disconnection) task after all concurrent tasks are finished. This can be implemented in another better way. Also, the current check of chip->in_pm isn't good enough for protecting the racy execution of multiple auto-resumes. This patch rewrites the logic of snd_usb_autoresume() & co; namely, - The recursive call of autopm is avoided by the new refcount, chip->active. The chip->in_pm flag is removed accordingly. - Instead of rwsem, another refcount, chip->usage_count, is introduced for tracking the period to delay the shutdown procedure. At the last clear of this refcount, wake_up() to the shutdown waiter is called. - The shutdown flag is replaced with shutdown atomic count; this is for reducing the lock. - Two new helpers are introduced to simplify the management of these refcounts; snd_usb_lock_shutdown() increases the usage_count, checks the shutdown state, and does autoresume. snd_usb_unlock_shutdown() does the opposite. Most of mixer and other codes just need this, and simply returns an error if it receives an error from lock. Fixes: 9003ebb13f61 ('ALSA: usb-audio: Fix runtime PM unbalance') Reported-and-tested-by: Alexnader Kuleshov Signed-off-by: Takashi Iwai

ALSA: usb-audio: proc: use found syncmaxsize to determine feedback format

2013-05-17T06:05:34+00:00

freqshift is only set for the data endpoint and syncmaxsize is only set for the sync endpoint. This results in a syncmaxsize of zero used in the proc output feedback format calculation, which gives a feedback format incorrectly shown as 8.16 for UAC2 devices. As neither the data nor the sync endpoint gives all the relevant content, output the two combined. Also remove the sync_endpoint "packet size" which is always zero and the sync_endpoint "momentary freq" which is constant. Tested with UAC2 async and UAC1 adaptive, not tested with UAC1 async. Reported-by: B. Zhang Signed-off-by: Torstein Hegge Signed-off-by: Takashi Iwai

ALSA: pcm_format_to_bits strong-typed conversion

2013-04-29T11:36:15+00:00

Add a function to handle conversion from snd_pcm_format_t to bitwise with proper typing. Change such conversions to use this function and silence sparse warnings. Signed-off-by: Eldad Zack Signed-off-by: Takashi Iwai

ALSA: usb-audio: convert list_for_each to entry variant

2013-04-04T06:30:06+00:00

Change occurances of list_for_each into list_for_each_entry where applicable. Signed-off-by: Eldad Zack Signed-off-by: Takashi Iwai

ALSA: usb-audio: Fix races at disconnection

2012-10-30T10:06:54+00:00

Close some races at disconnection of a USB audio device by adding the chip->shutdown_mutex and chip->shutdown check at appropriate places. The spots to put bandaids are: - PCM prepare, hw_params and hw_free - where the usb device is accessed for communication or get speed, in mixer.c and others; the device speed is now cached in subs->speed instead of accessing to chip->dev The accesses in PCM open and close don't need the mutex protection because these are already handled in the core PCM disconnection code. The autosuspend/autoresume codes are still uncovered by this patch because of possible mutex deadlocks. They'll be covered by the upcoming change to rwsem. Also the mixer codes are untouched, too. These will be fixed in another patch, too. Reported-by: Matthieu CASTET Cc: Signed-off-by: Takashi Iwai

ALSA: snd-usb: remove refactorization left-overs

2012-04-21T15:40:28+00:00

Drop some struct members and definitions that became obsolete during the refactorization of the driver. Signed-off-by: Daniel Mack Signed-off-by: Takashi Iwai

ALSA: usb: Remove obsoleted fields from struct snd_usb_substream

2012-04-13T10:57:39+00:00

Many fields have been moved to struct snd_usb_endpoint. Also fix the proc output to correspond to the new structure. Signed-off-by: Takashi Iwai